Azo-dyestuffs insoluble in water



'cially suitable to produce the dyeings by United States Patent Ofifice V 2,908,679 AZO-DYESTUFFS INSYOLUBLE IN WATER Herbert Kracker, Fritz Bauer, Werner Kirst, Rudolf Lowenfeld, and Walter Staab, Offenbach (Main), Germany, assignors to FarbwerkeHoechst Aktiengesellschaft vormals Meister Lucius & Bruning, Frankfurt am Main, Germany, a corporation of Germany No Drawing. Application December 17, 1957 Serial No. 703,271

Claims priority, application Germany December 19, 1956 i 7 Claims. Cl. 260-188) The present invention relates to valuable new iazodyestuffs insoluble in water and to a process for pro ducing these dyestuffs on shaped structures of aromatic polyesters or cellulose acetate; more particularly it relates to azo dyestulfs corresponding to the following general formula a a O Alkyl J) Alkyl OH R wherein the benzene nucleus a may be substituted by a an alkyl or alkoxy groupand/ora halogen-atom, and

R represents hydrogen, an alkyl oralkoxy group.

We have found that valuable water-insoluble azo-dyestuffs can be produced on shaped structures of aromatic polyesters, for example fibers, foils, fabrics or ribbons, by coupling on these structures the diazonium compound of an aminoazo-compound corresponding to the general formula Alkyl Alkyl wherein the benzene nucleus a may be substituted by .an alkyl or alkoxy group and/or a halogen atom, with an arylamide of 2,3-hydroxynaphthoic acid of the general formula on R . glycol terephthalate.

2,908,679 Patented Oct .13,

coupling component and the aniinoazo-compound to the shaped structure from an alkaline solution or suspension in the presence of a solution promoter, such as tetrahydronaphthalene, while simultaneously lowering'the pH- value of the solution or suspension by the addition of an ammonium salt of an inorganic or organic acid, an" ester or acid halide of an organic acid or an alpha-halogenated fatty acid, then diazotizing the aminoazo-compound and coupling it with the coupling component. For dyeing in a continuous manner the'structure can'also be treated in a short liquor with the aminoazo-compound and the coupling component while the amine and cou-.

pling component are in solution'in an organic solvent,

subsequently it is subjected to a steaming operation or to a dry heat treatment and the dyeing is then developed in known manner by diazotization and coupling; Finally, the coupling component can be applied together with the aminoazo-compound to the textile material, at 'a temperature of above 100 C., from an alkaline solution or suspension in the presence of a solvent, such as 'diacetone alcohol, a solution promoter for the coupling component, such as tetrahydronaphthalene or methoxybutyl acetate, an alkali metal salt of a sulfonated oleic acid and a compound lowering the pH-valueof the solution or suspension, the aminoazo-compound is then diazotized and coupled with the coupling component. When there is used as a solution promoter an ester, for example methoxybutyl acetate, the addition of a further compound lowering the pH-value of the solution or suspension may, if desired, be dispensed with.

The process of this invention is very suitable for the production of valuable dyestuffs on the condensation products of polyvalent aromatic carboxylic acids with polyhydric alcohols commonly designated as aromatic polyester fibers, especially of the type of the polyethylene- It can also be carried out on shaped structures of cellulose acetate.

The aminoazo-compounds used as diazo components, which have not'been completely described in literature, can be prepared by known methods, for example by coupling diazotized aniline or the substitution products thereof with 1-amino-2,5-dialkoxybenzenes.

The following examples illustrate the invention, but

they are not intended to limit it thereto.

Example 1 100 kilograms of polyethyleneglycol terephthalate material in. the form of yarn or fabric are treated-for 1 hour at 120 1-(2,3-hydroxynaphthoylamino)-2-methoxybenzene and 0.56 kilogram of 4 -amino-2,5-dimethoxy-4'-chloro-l,1'- azobenzene are dissolved at C. in a mixture of 0.225

liter of sodium hydroxide solution of 38 B.,13.liters' of diacetone alcohol, 1 liter of tetrahydronaphthalene, 0.57 kilogram of a dispersing agent of the type of an alkylaryl sulfonate, 0.2 kilogram of butyl alcohol and 0.5 kilogram of diglycol and the solution is introduced into 1500 liters of water of C. to which; there is added 0.225 kilogram of tartaric acid diethylester.

'The material is thencooled to 80 C., rinsed hot and cold and diazotized with 2.25 kilograms of sodium nitrite and 7.5 kilograms of sulfuric acid of 96% strength in 1500 liters of water, by introducing the material, heating the bath to 80 C. 80-85" C.

The material is then rinsed, after-treated for 15 minutes and treating for 30 minutes at C. in the following baths 0.6 kilogram of at 95 C. with 9 liters of a sodium hydroxide solution of 38 B., Skilograrns of sodium dithionite and 3 kilograms of a non-ionogenic Washing agent in 1500 liters of water, rinsed again and dried. A navy blue dyeing of very good properties of fastness is obtained.

When there is used in the above example 0.6 kilogram of 4-amino-2,5,4-trimethoxy-l,l'-azobenzene instead of 0.56 kilogram of 4-amino-2,5-dimetl1oxy-4'-chloro-1,l'- azobenzene, a greenish navyblue dyeing of similar good fastness properties is obtained.

Example 2 g 100 kilograms of polyethyleneglycol terephthalate material in the form of yarn or fabric are treated for 30 minutes at boiling temperature in the following bath: 0.9 kilogram of 1-(2,3'-hydroxynaphthoylamino)-2-methoxybenzene and 1 kilogram of 4-amino-2,2',5-trimethoxyl,l"-azobenzene are dissolved in the hot in a mixture of 4.8 kilograms of tetrahydronaphthalene,-2.5 kilograms of diglycol, 4 kilograms of a dispersing agent of the type of an alkylaryl sulfonate, 0.72'kilogram of butyl alcohol, 0.3 kilogram of methylhexalin and 0.31 liter of sodium hydroxide solution of 38 B. and introduced into 3000 liters of soft water of 90 C., to which 0.4 kilogram of tartaric acid diethylester has been added. The material is then rinsed hot and cold and diazotization is carried out with 6 kilograms of sodium nitrite and 9 kilograms of sulfuric acid of 96% strength-in 3000 liters of water by introducing the material, heating the bath to 80 C. and treating for 30 minutes at 80-85 C.

The-material is then rinsed, after-treated for 15 minutes at 95 C. with 12 liters of sodium hydroxide solution. of 38 B., 3kilogramsof sodium dithionite and 3 kilograms of a non-ionogenic washing agent in 3000 liters of water, rinsed again and dried.

A navy blue dyeing of very good properties of fastness is obtained.

Example 3 100 kilograms of triacetyl cellulose in the form of continuous thread are treated for 1 hour at 95-100" C. inVthe following bath: 0.9 kilogram of l-(2,3-hydroxynaphthoylamino)-2-methoxybenzene and 0.9 kilogram of 4-arnino-2,5,4-trimethoxy-1,1-azobenzene are dissolved in a hot mixture of 4.8 kilograms of tetrahydronaphthalene, 2.5 kilograms of diglycol, 4 kilograms of a dispersing agent of the type of an alkylaryl sulfonate, 0.72 kilogram of butyl alcohol, 0.3 kilogram of methylhexalin and 0.3 liter of sodium hydroxide solution of 38 B. and'in'troduced into 3000 liters of water of 90 C. to which 0.4 kilogram of tartaric acid diethylester has been added.

The material is then rinsed and diazotized with 6 kilograms of sodium nitrite and 9 kilograms of sulfuric acid of 96% strength in 3000 liters of water by introducing the material, heating the bath to 50 C. and treating at this temperature for 30 minutes. The material is then rinsed, after-treated for 15 minutes at 60 C. with 9 liters of sodium hydroxidesolution of 38 B., 3 kilograms of sodium dithionite and 3 kilograms of a nonionogenic washing agent in 3000 liters of water, rinsed again and dried.

:A .navy blue dyeing of good fastness properties is obtained. 2

When there is used in the above example 0.7 kilogram of 4-amino-2,5-dimethoxy-4-chloro-l,1' azobenzene instead of 0.9 kilogram of 4-amino-2,5,4'-trimethoxy-l,lazobenzene, a reddish navy blue dyeing is obtained.

Similar results are obtained by using shaped structures of 2,5-acetyl cellulose.

The following table comprises a number of further components which can be used in the process of this invention and the tints of the aZo-dyestuffs produced with these components on polyesters or cellulose acetate, which likewise possess good properties of fastness:

Diazo component Coupling component Tint 4-ainino-2, 5-dimethoxy-1, 1- 1- (2, 3 -hydroxynaph- Navy blue.

azobenzene. thoylamino) -2 methoxybenzene.

4-amino-2, 5-diethoxy-1,1- do reddish azobenzene. navy blue.

4 amino 2, 5 dimethoxy do navy blue.

3 methyl 4 chloro 1, 1- azobenzene.

4-am'mo-2,5-dimethoxy-2- do Do.

methyl 3 chloro 1, 1' azobenzene.

4 amino 2, 5, 4 -trimetl1oxy- Do.

3-ehlor0-l, 1-azobenzene.

4 amino 2, 5 dimethoxy 3'- Do.

chloro 4 methyl l, 1 azobenzene.

4 amino 2, 5 dimethoxy 2- Do.

methyl 4 chloro 1, l azobenzene.

4 amino 2, 5 dlmethoxy greenish 2 ethoxy 1,1 azobenzene. navy blue.

4 amino 2, 5 dimethoxy do Do.

4 ethoxy 1,1 azobenzene.

4 amino 2, 5 diethoxy 4 do greenish methoxy l, 1' azobenzene. blue.

4 amino 2. 5 dimethoxy 3- 1 (2, 3 hydroxynaphgreenish methyl 4' chloro 1, 1 thoyl amino) 2 navy blue. azobenzene. methylbenzene.

4 amino 2, 5 dimethoxy .do Do.

2 methyl 3 chloro -1, 1- azobenzene.

4-amino-2, 5, 4 -trimethoxydo Do.

1, 1-azobenzene.

4-amino-2, 5-dirnethoxy-4- do Do.

chloro-l, 1 azobenzene.

4 amino 2, 5 dimethoxy 2- d0 covered chloro-1, 1-azobenzene. greenish dark blue.

4 amino 2, 5 dimethoxy 3- .do covered ehlorod, 1-azobenzene. dark blue.

4 amino 2, 5 dimethoxy 3- 1 (2, 3 hydroxynaphreddish methyl 4 chloro 1, 1 thoylarnino) 2 ethnavy blue. azobenzene. oxybenzene.

4-ami.no-2,5-dimethoxy-2- do Do.

methyl 3 chloro 1, l azobenzene.

4 amino 2, 5, 4 trimethoxydo navy blue.

1, 1-azobenzene.

4 amino 2, 5 dimethoxy -4- .do reddish chloro-1, 1'-azobenzene. navy blue.

4 amino 2, 5 dimethoxy 2- ...do covered chloro-1, 1-azobenzene. reddish dark blue.

4 amino -2, 5 dimethoxy -3- .do reddish chloro-1, 1-azobenzene. navy blue.

4 amino -2, 5 dlmethoxy' -2- 2, 3 hydroxynaphthoylgrey-blue.

methyl 3 chloro 1, 1 aminobenzene. azobenzene.

4 amino 2, 5, 4 -trimetl1oxy- 1 (2, 3 hydroxynaphnavy blue.

1, 1-azobenzene. thoyl amino) 2 ethylbenzene.

We claim:

wherein R represents a member selected fromthe group consisting of hydrogen, methyl, ethyl, methoxy and ethoxy, X represents a member selected from the group ,7

consisting of methyl and ethyl, Y represents a member selected from the group consisting of hydrogen and chlorine, and Z represents a member selected from the group consisting of hydrogen, methyl, methoxy and ethoxy.

2 Water-insoluble azo-dyestuffs corresponding to the following general formula C H; Y

A) 0 H Z wherein Y represents a member selected from the group consisting of hydrogen and chlorine, and Z represents a member selected fiom the group consisting of hydrogen, methyl, methoxy and ethoxy.

3. The azo-dyestufi" corresponding to the following formula OCH;

on CO-NHQ O CH:

4. The azo-dyestulf corresponding to the following formula 0 C H; N=N N= 0-0011,

5. The azo-dyestuif corresponding to the following formula 6. The azo-dyestuif corresponding to the following formula OCH N=N ON=NQO1 I dona 0113 OH I o ONHC $011;

7. The azo-dyestufi corresponding to the following formula. 

1. WATER-INSOLUBLE AZO-DYESTUFFS CORRESPONDING TO THE FOLLOWING GERERAL FORMULA 